Family plea for missing Christchurch man Michael McGrath

The family of a missing Christchurch builder has pleaded with the public for any information as to his whereabouts. 

Michael McGrath, 49, went missing almost two weeks ago and his family say they're deeply concerned. 

"His family and friends are desperate to get him home and we're making these pleas for any sightings or activity," Mr McGrath's brother, Simon McGrath said.

Mr McGrath was last seen 12 days ago.

Police are appealing for sightings of the keen cyclist and his bike in the Halswell area.

"Did you see Michael on his blue mountain bike wearing a white and navy helmet?" Detective Inspector Daryll Sweeney asked in a media conference on Friday.

Missing Persons, Christchurch
Simon McGrath and Daryll Sweeney fronted media on Friday (Emma Cropper/Newshub)

"Someone could have some sort of information that could help police. It might appear trivial but it may be the piece of the puzzle we need to solve this mystery," Simon McGrath added. 

Police have intensified investigations in the past 48 hours - focusing their attention on a correction officer's Halswell house.

Mr Sweeney says there's still hope Michael McGrath is alive.

Police are scaling back investigations at Mr McGrath's three bedroom house and will be handing it back to the family on Saturday. 

They are now relying on the public for help. 

"A lot of our drive at the moment is around sightings of Michael and has anybody seen him, his motor vehicle, his bike or has he been working at your place on working projects and that's really our focus," Mr Sweeney said.